<?php
/**
 * Zend Framework
 * LICENSE
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 * @category Zend
 * @package Zend_Config
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 * @version $Id: Xml.php 24593 2012-01-05 20:35:02Z matthew $
 */
/**
 *
 * @see Zend_Config_Writer
 */
require_once 'Zend/Config/Writer/FileAbstract.php';
/**
 *
 * @see Zend_Config_Xml
 */
require_once 'Zend/Config/Xml.php';

/**
 *
 * @category Zend
 * @package Zend_Config
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 */
class Zend_Config_Writer_Xml extends Zend_Config_Writer_FileAbstract {

    /**
     * Render a Zend_Config into a XML config string.
     * @since 1.10
     * @return string
     */
    public function render () {
        $xml = new SimpleXMLElement ('<zend-config xmlns:zf="' . Zend_Config_Xml::XML_NAMESPACE . '"/>');
        $extends = $this -> _config -> getExtends ();
        $sectionName = $this -> _config -> getSectionName ();
        if (is_string ($sectionName)) {
            $child = $xml -> addChild ($sectionName);
            $this -> _addBranch ($this -> _config, $child, $xml);
        } else {
            foreach ($this -> _config as $sectionName => $data) {
                if ( ! ($data instanceof Zend_Config)) {
                    $xml -> addChild ($sectionName, (string) $data);
                } else {
                    $child = $xml -> addChild ($sectionName);
                    if (isset ($extends[$sectionName])) {
                        $child -> addAttribute ('zf:extends', $extends[$sectionName], Zend_Config_Xml::XML_NAMESPACE);
                    }
                    $this -> _addBranch ($data, $child, $xml);
                }
            }
        }
        $dom = dom_import_simplexml ($xml) -> ownerDocument;
        $dom -> formatOutput = true;
        $xmlString = $dom -> saveXML ();
        return $xmlString;
    }

    /**
     * Add a branch to an XML object recursively
     * @param Zend_Config $config
     * @param SimpleXMLElement $xml
     * @param SimpleXMLElement $parent
     * @return void
     */
    protected function _addBranch (Zend_Config $config, SimpleXMLElement $xml, SimpleXMLElement $parent) {
        $branchType = null;
        foreach ($config as $key => $value) {
            if ($branchType === null) {
                if (is_numeric ($key)) {
                    $branchType = 'numeric';
                    $branchName = $xml -> getName ();
                    $xml = $parent;
                    unset ($parent -> {$branchName});
                } else {
                    $branchType = 'string';
                }
            } else 
                if ($branchType !== (is_numeric ($key) ? 'numeric' : 'string')) {
                    require_once 'Zend/Config/Exception.php';
                    throw new Zend_Config_Exception ('Mixing of string and numeric keys is not allowed');
                }
            if ($branchType === 'numeric') {
                if ($value instanceof Zend_Config) {
                    $child = $parent -> addChild ($branchName);
                    $this -> _addBranch ($value, $child, $parent);
                } else {
                    $parent -> addChild ($branchName, (string) $value);
                }
            } else {
                if ($value instanceof Zend_Config) {
                    $child = $xml -> addChild ($key);
                    $this -> _addBranch ($value, $child, $xml);
                } else {
                    $xml -> addChild ($key, (string) $value);
                }
            }
        }
    }

}
